pallasite

Pallasite is a class of stony-iron meteorites characterized by a nickel–iron metal matrix containing abundant olivine crystals. The olivine, typically forsterite, forms translucent grains that range from millimeters to several centimeters. The contrast between the metallic phase and the olive-green crystals makes pallasites among the most visually striking meteorites. They are commonly divided into main-group pallasites and exotic varieties based on trace-element chemistry.

Formation is thought to occur at the core–mantle boundary of a differentiated asteroid, where metallic melt and silicate mantle material came into contact. Metal droplets can become surrounded by silicate crystals and then be transported and cooled, producing a mixture of metal and olivine. The exact processes remain debated.

Naming and distribution: The name honors the 18th-century naturalist Peter Pallas, associated with the early study of these meteorites. Pallasites are relatively rare and have been recovered worldwide as finds; notable specimens include Esquel (Argentina), Fukang (China), Imilac and Brahin (South America/Europe), and Piñon Flats (USA).

Scientific significance: Because pallasites contain both metal and silicate phases, they provide direct samples from a planetary interior and are valuable for studying differentiation and metal–silicate interactions in the early solar system. They are also highly prized by meteorite collectors for their distinctive appearance.